Search for Unstable Heavy and Excited Leptons in e+e- Collisions at sqrts = 170-172 GeV
Abstract
We have searched for unstable neutral and charged heavy leptons, N and L+/-, and for excited states of neutral and charged leptons, nu*, e*, mu* and tau*, in e+e- collisions at centre-of-mass energies of 170 and 172 GeV using the OPAL detector at LEP. No evidence for their existence was found. From the analysis of charged-current decays of pair-produced unstable heavy leptons, and of charged-current and photonic decays of pair-produced excited leptons, lower limits on their masses are derived. From the analysis of charged-current and photonic decays of singly-produced excited leptons, upper limits on the ratio of the coupling to the compositeness scale, f/Lambda, are determined for masses up to the kinematic limit.
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